MIPS: Critical fix for label binding in RegExp engine when trampoline is emitted.

src/mips/regexp-macro-assembler-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 987 matching lines @@
   Pop(a0);
   __ sw(a0, register_location(register_index));
 }
 
 
 void RegExpMacroAssemblerMIPS::PushBacktrack(Label* label) {
   if (label->is_bound()) {
     int target = label->pos();
     __ li(a0, Operand(target + Code::kHeaderSize - kHeapObjectTag));
   } else {
+    Assembler::BlockTrampolinePoolScope block_trampoline_pool(masm_);
     Label after_constant;
     __ Branch(&after_constant);
     int offset = masm_->pc_offset();
     int cp_offset = offset + Code::kHeaderSize - kHeapObjectTag;
     __ emit(0);
     masm_->label_at_put(label, offset);
     __ bind(&after_constant);
     if (is_int16(cp_offset)) {
       __ lw(a0, MemOperand(code_pointer(), cp_offset));
     } else {
@@ skipping 361 matching lines @@
 }
 
 
 #undef __
 
 #endif  // V8_INTERPRETED_REGEXP
 
 }}  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS